The public still knows little about a cyberattack that has been disrupting Seattle-Tacoma International Airport since Saturday.

Websites, email and phones at the airport and Port of Seattle went down Saturday morning and were still down Monday evening. The airport’s Wi-Fi and terminal screens also weren’t working.

Major airlines have weathered the challenges, with more than 72,000 passengers making their flights Sunday. Delta Air Lines and Alaska Airlines both use Sea-Tac as a hub. Neither has reported any major problems with disruptions.